Sewage-ejecting system



Feb.11, 1930. LC JENNINGS 1,746,428 SEWAGE EJECTING SYSTEM l Filed March 25. 1925 3 sheets-sheet 1 [WHL/HJ C. v/enniingg 'Feb-,11, 1930- l. c. JENNINGs 1,746,423

SEWAGE EJECTING SYSTEM i Filed March 25, 1925 5 Sheets-Sheet 2 Feb. l1, 1930. 1 C, JENNlNGS 1,746,428

SEWAGE EJECTING SYSTEM Filed Mrch 275, 1925 5 Sheets-Sheet 3 gli? @www #Mfg Patented Feb. 11; 1930- UNITED STATES mvING o. JENNINGS, or SOUTH NORWALK, coNNEc'rIcUT SEWAGE-EJECTING SYSTEM Application-ind March 25, 1925. Serial No. 18,276.

The object of this invention is to improve the apparatus shown, described, and claimed in Letters Patent granted to me-r April 29,

y 1924, No. 1,492,171.

In this patent, I have shown a sewage,

ejector of the air compressor type, in which l'the air under pressure is supplied by a rotary hydro-,turbine air pump and through which pump the air vents of operation.' i.

I have encountered diiculty'in some locations in lusing the hydro-turbineair pump to compress the air and in allowing the air to vent through the pump, by reason-of the fact 15 that it is necessary to provide a water supply for the vhydro-turbine pump so that it will always be in condition .to operate.l 4

-The means I preferably employ for supply ing the hydro-turbine pump With priming Water consists of a small supply tank or receptacle to which city water or other supply is connected, and in which a level just above the inlet tothe pump is maintained by a float controlled valve. If this valve should leak there might be too muchwater Yin this supply tank, which, in some cases where the drains to the sewage ejector are almost at a level with the same, would choke the back How of air through the pump. i

Another diiiiculty encountered was that when the water or` sewage flowed into the ejector at a rapid rate, the air would flow back through the air pump so fast that when the pump was started in operation, the same was unable to get priming water quickly and unable to start into operation immediately.

Under these conditions the pump might run for fifteen or twenty seconds or longer be- 46 fore it would start to compress the air, during which time the ejector would partly fill, which would increase the time required to discharge the sewage from the ejector, and thus reduce its capacity.`

The object of thepresent invention is to overcome these difliculties and keep the air pump properly primed. y

The invention is illustrated in the accompanying three sheets of drawings, in which Figure l is a sectional diagrammatic elewhen the pump is cut out vation of the apparatus showing the same in operation ejecting the sewage;

Fig. 2is a similar view showing thev4 pump out of opera-tion and the compressed air escapinfrom theejector;

'g'. 3 is an enlarged sectional elevation` of the vent valve I Fig. 4 is a partial sectional elevation illustrating the valve in closed position;

Fig. 5 is a sectional elevational illustrating the valve in open position allowing the venting of thel ejector;

Fig. 6 is a cross sectional plan on the line 6-d6 of Fig. 4, illustrating a part of the valve; an l Fig. 7 is a planjview of the operating piston of the valve.

Referring to the drawings and in detail,- A designates the ejector or pot to which the sewage is led by an inlet pipe B, having a for; Wardly opening check valve, and from which the sewage is lforced through an outlet `pi'pe C alsov having a forwardly opening check valve.- l)V designates the hydro-turbine air compressor, the outlet of which is connected by pipe E to the ejector A. A float F is arranged in the ejector and operates a switch which controls the operation. of an electric motor driving the pump. These parts a're arrangedsubstantially as described inV my prior. patent and operate, brieiy as follows:

' `llVhen the sewage reaches a high level in the ejector, the oat will throw the switch so that the motor will sta-rt the pump in operation. The pump will force air into the top of the.

ejector and the sewage will be forcedf'therefrom as illustrated in Fig. l. When the level of the sewage falls to a loyv determined point, the fioat operates the switch to stopv the motor and throw the pump out of operation.

When the pump stops, the'compressed air will flow out through the ipe E, and when the air pressure is relieved), flow into the pot, as illustrated inA Fig. 2, until the high level is reached, when the oper- Vation will be repeated.

lIt is necessary to provide the pump `with priming water so that it will always be' ready toI operate. To do this, I arrange a priming or surge tank 10 on the pump inlet to which the sewage will v a suppl f water 11 is connected and led into the tank through a valve 12 controlled by a float 13. These parts are arranged so that the normal level of the water in the tank 10 will be just above the level of the pump inlet so that the pump always will have the proper amount 0f make-up or operating water.

4 The small surplus of water that passes over to the pump from this source is fed along into the ejector and passes out with the sewage.

To provide for the venting of the ejector, I arrange a vent valve G in the pipe E. This vent valve has a suitable casing 14.- A bushing or cylindrical shell 15 having slots eX- tending partways of its length has a valve seat 16 at its top 6 A plate 17 is attached to the casing 14 by screws 18 and holds these parts in position. a I

A vent pipe 19 is connectedto this plate 17. This pipe 19 may connect to the air inlety of the pump or separately to the atmosphere or to the place where it isdesired to vent the air.

Sliding inside of the cylindrical shell 15 is a valve 20, which has a rubber or bearing face 21, which can seat on the valve seat 16,l the bearing face 21 being held to the valve by` screw 22. The valve 2O has a. dependingy stem 23,- a bolt-head or collar 24 being formed on the lo'wer end thereof.

' A piston 25 is loosely fitted on the stem 23. This piston may have small slots or grooves 26 in its upper face, as illustrated in Fig. 7, s0 that it will not stick to the lower side of the valve 20. The valve 2O and the piston 25 preferably are made out of non-oxidizable metal. A cap-27 is threadedvin the bottom part of the casing` and contains a rubber or soft material cushion 28 against which., the

, head 24 can strike;

When the pump is in operation and air' is being forced into the ejector or pot A, as shown in Fig. 1, the pressure of the air on the underside of the piston 25 and the valve 20 will lift these parts to the position shown in Fig. 3 and flow to the vent pipe 19 will thus be prevented and the air compressed in the pump will pass directlyoverj-tojthepot or ejectonA. 4 Y

When the pump is cut o ut of operation the 'flow of air through the vent valve stops and the piston 25 dropstothe pos1tion shown in Fig. 4, closing the -passage between the compressor and the sewage ejector. lThe air in the compressoris relieved of pressure by the water falling to the bot-tom of the casing, allowing the inlet and outletfports to connect to the atmosphere: This relieves the button@y of `piston-25ojf pressure, and the pressure iny the sewage ejectorpot is communicated directl'y on top of this piston. which has a greaterkarea than the bearing face 210i the valve 22. -This causes the piston 25, carry-ing with it valve 22. to drop to the position shown in Fig. 2 and Fig. 5, whereby the air in the pot can escape out through the vent pipe 19."

It' will also be seen that when the flow of air into the t ceases by the stopping of the pump and t episton 25 drops down on the stem 23 of the valve 22, it will strike on the head 24 and this will jar and help release the valve from the valve seat 16. This action will neutralize any tendency of the bearing face 21 to stick and will ensure operation of the vent valve at all times.

When the pump starts again in operation, the pressure of the air acting underneath the piston 25and the valve 20 will restore the parts to the position shown in Figs. 1 and 3.

The before described operation of this vent valve will take place easily, because the hydro-turbine pump itself vents to the air when it stops and when the back flow of air starts the vent valve will operate immediately.

The use of the pistonvin combination with the valve makes a vent valve which will operate efficiently in the location shown and by using the same the priming of the hydroturbine air pump will not interfere with the connected thereto, a vent valve in this connection constructed to close the vent and conneet/the p mp and'theejector when the pump starts in peration and to cut of communication between the ejector and pump and alflow the air in the ejector to vent or escape when the pump stopsoperation.

2. In a sewage ejecting system, the combination of an ejector, a hydro-turbine air pump connected thereto, means for supplymg the pump with make up water, a vent valvein said connection constructed to close the vent and connect the pump and the ejc tor when the pump starts in operation and to cut off communication between the ejector and pump and allow the air in the ejector l'to vent or esc/ape when the pump stops opera- 3. In a sewage ejec'tng system, the combi; n'ation of an ejector, a hydro-turbine air pump connected thereto, a' tank and float valve for supplying the hydro-turbine pump with priming water, and a vent valve in said connection constructed to close the vent and- Vconnect the pump and the ejector when the pump starts in operation and to cut o communlcatlon between the ejector and pump and allow the air in the ejector to vent or escape when the pump stops operation.

4. In a'sewage ejecting system7 the combination of anV ejector, a hydro-turbine air pump connected thereto through which pump air can ventwhen it Ais stopped, a vent valve in the connection between the air pump and the ejector constructed to close the vent and connect the pump and the ejector when the -m'v pump starts in operation and to cut off com-l munication between the ejector and pump and allow the air in the ejector to vent or escape when the pump stopsoperation and the air starts to flow back through the pump. In testimony whereof I have hereunto afj nefl my signature.

IRVING C. JENNINGs' 

